* {
    margin: 0;
    padding: 0;
}

body {
    font: 16px/1.8 "Microsoft Yahei", verdana;
}

.nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: rgba(0,0,0,0.2);
    z-index: 10;
    /*opacity: 0.1;*/
    /*-webkit-opacity: 0.1;*/
    /*-moz-opacity: 0.1;*/
    /*filter:alpha(opacity=10); ;*/
}

.section {
    position: relative;
    /*background-color: #fff;*/
    overflow: hidden;
    text-align: center;
}

/*��һ����ʽ����*/

.section1 p {
    margin: 800px auto 0;
    color: #444;
    font-size: 18px;
    width: 60%;
    line-height: 30px;
    opacity: .6;
}

/*�ڶ�����ʽ����*/
h1 {
    display: block;
    margin: 20px auto 0;
    padding-bottom: 5px;
    width: 300px;;
    border-bottom: 2px solid red;
    color: #333;
    font-size: 40px;
    font-weight: normal;
}

.section2 .row:hover {
    transform: scale(1.1);
    transition: transform .25s;
}

.section2 p {
    color: #444;
    font-size: 16px;
}

/*��������ʽ����*/
.section3 {

}

/*��������ʽ����*/

.section4 h4 {
    margin-top: 10px;
}

.section4 .row {
    width: 86%;
    margin: auto 7%;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-around;
    color: #333;
    font-size: 16px;
}

.section4 .column {
    width: 50%;
    border-radius: 10px;
    box-shadow: 4px 4px 8px #aaa;
    margin: 10px;
    padding-bottom: 30px;
    background-color: #f5f5f5;
}

.section4 .column p {
    width: 90%;
    margin: 10px auto;
}
.slide1 img{
    margin: 50px 10px 30px 10px;
    border-radius: 10px;
}
.slide2 img{
    margin: 10px 10px 10px 10px;
    border-radius: 10px;
}